Stefan Miklosovic created CASSANDRA-17904:
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Summary: Consider to not warn about deprecated properties in logs
when the value is not deprecated
Key: CASSANDRA-17904
URL: https://issues.apache.org/jira/browse/CASSANDRA-17904
Project: Cassandra
Issue Type: Improvement
Reporter: Stefan Miklosovic
When there is an initialisation of database descriptor for tools, for example
via "Util.initDatabaseDescriptor()", it will eventually buble up to
"YamlConfigurationLoader.check" where this is logged:
{code}
if (!deprecationWarnings.isEmpty())
logger.warn("{} parameters have been deprecated. They have new names and/or
value format; For more information, please refer to NEWS.txt",
deprecationWarnings);
{code}
For example, I saw this log:
{code}
WARN 09:07:42,486 [key_cache_save_period, counter_cache_save_period,
row_cache_save_period] parameters have been deprecated. They have new names
and/or value format; For more information, please refer to NEWS.txt
{code}
The "problems" I see are two:
1) it pollutes the console for tool commands, when a tool needs to initialise
DD, at the very beginning of the output.
2) When you look closely, for example at key_cache_save_period, by defaul, in
cassandra.yaml, it has value "4h". My question is: why is it necessary to mark
that as deprecated when the value is already in new format? In other words, I
would log that warning only in case that the expected value of a property is
not in the new format. But when it already is, why do we need to inform a user
about that?
I think it would require to take some extra care for cases like these in
YamlConfigurationLoader.getProperty to not add deprecated properties if their
value is already new.
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